It would be nice to include a hyperlink in the post above for each event above so that people can click through to see the actual results of each event. Perhaps a link to the thread in which people posted their results.

'In an infinite universe, the one thing sentient life cannot afford to have is a sense of proportion.' - Douglas Adams

No. Challenge event #5 is in progress now (R16 at the moment). After it's over, if someone is willing to organize another event they'll start a new thread to take registrations. And that thread where players can sign up to play will be linked in news for a few days. We don't know yet if and when there will be an event #6.